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Finding the Fourth Proportional to 391,656, 540,486.72 and 212,808

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Solution

The fourth proportional to 391,656, 540,486.72 and 212,808 is: 293,675.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,656 : 540,486.72 = 212,808 : x
  2. Step 2: Convert to fraction form
    391,656/540,486.72 = 212,808/x
  3. Step 3: Cross multiply
    391,656x = 540,486.72 × 212,808
  4. Step 4: Simplify right side
    391,656x = 115,019,897,909.76
  5. Step 5: Solve for x
    x = 115,019,897,909.76/391,656
  6. Step 6: Final answer
    x = 293,675.82

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.